连续信号的采样定理的验证，对采样定理的理解有一定指导作用-Sampling theorem for signals in the authentication, the understanding of the sampling theorem have a certain role in guiding
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001971s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.072561s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000972s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001214s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000860s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003162s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000859s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003767s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.020854s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001237s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 162353 [ RunTime:0.024762s ]
